Upd09051.bin

To understand the file, you must understand the hardware. The NEC µPD9051 is a 4-bit single-chip microcontroller, part of the µPD90xx series. These chips were ubiquitous in consumer electronics from the early 1980s through the mid-1990s. Specifically, the µPD9051 was designed for:

The Digital Heartbeat of the Ultimate Driving Machine: An Analysis of UPD09051.bin upd09051.bin

: Enterprise Device Grouping